Use an ActiveX control in your Win32 Project without MFC with CreateWindowEx or in a dialog box

• Download demo project - 34.3 KB

Introduction

You would really like to use the multitude of ActiveX controls available in Windows and on the Internet, however you did have to use MFC or OWL or a non native platform. The solution is here! A HWND that acts as an ActiveX container!

Using the code

In short, AX is a HWND that acts as an ActiveX container. You register its class with AXRegister():

int __stdcall WinMain(HINSTANCE h,HINSTANCE,LPSTR,int)
{
    OleInitialize(0);
    if (!AXRegister())
        return 0;
    ...
}

Using the control is easy. You either use CreateWindowEx(), or specify the AX control within the RC editor:

DIALOG_1 DIALOGEX 0, 0, 500, 400
...
{
    CONTROL "{8856F961-340A-11D0-A96B-00C04FD705A2}", 801, "AX", 
                WS_CHILD | WS_VISIBLE, 0, 0, 500, 400
}

As the Window Title, you use the CLSID of the ActiveX object you wish to create. Here I used the CLSID of Internet Explorer. You can find all the CLSIDs you want by using MS's OLEView.

When you call CreateWindowEx() or DialogBox() to create the window, the ActiveX object will be created, but it won't as yet be activated in place. Use AX_INPLACE (wParam = 1 to Activate , wParam = 2 to deactivate):

case WM_INITDIALOG:
{
    HWND hX = GetDlgItem(hh,801);
    SendMessage(hX,AX_INPLACE,1,0)
...

And how do you access the interfaces that this ActiveX object supports? Use AX_QUERYINTERFACE, with WPARAM as a pointer to the reference ID, and LPARAM as a double pointer to the output interface. I try this with IWebBrowser2:

// Navigate
IWebBrowser2* wb = 0;
SendMessage(hX,AX_QUERYINTERFACE,(WPARAM)&IID_IWebBrowser2,(LPARAM)&wb);
if (wb)
{
    wb->Navigate(L"http://www.codeproject.com",0,0,0,0);
    wb->Release();
}

Points of Interest

AX.CPP and AX.H contain more code, not yet implemented (or yet buggy!) . My plan is to allow Advise Sink connections, OLE menus etc. in the future. AX implements as few as possible of the IOleClientSite methods, for simplicity. When you further explore OLE and ActiveX, you put your own implementations there!

With the above IWebBrowser2, for example, you might need to get notified when the user clicks on a URL. This can be done using IDispatch, but it isn't simple and I won't demonstrate it here, because it depends on the ActiveX control you want to host.

Good luck!

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